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Penalty theory in dynasty puzzles
Nikoli-style pencil-and-paper logic puzzles, like Sudoku, Yajilin, and many more, have very simple rules. But you can often build puzzles that require thinking in really cool ways, seemingly totally unrelated to what the rules literally say.
Here I will rank the items of various lists by my opinion of good they are, which is of course objectively correct in all cases.
Factorial in Mathematica
Here is a list of (mostly) increasingly stupid ways
of calculating the factorial of
n in Mathematica.
Names and renaming
There are only two hard things in Computer Science: cache invalidation and naming things.